By Lashkhi A.   Kvirikashvili T.   in Communications in Algebra

ISSN:0092-7872|36|9|3564-3573

Taylor & Francis Ltd‎(2008)‎

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By Kvirikashvili T.   Lashkhi A.   in Journal of Mathematical Sciences

ISSN:1072-3374|195|4|496-504

Springer Publishing Company ‎(2013)‎

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